Diatoms/cyano please need help!

[Gold3nboi]

Hello everyone, I have a 320 gallon system about 4 years old. My tank from Monday has diatoms and some cyano all across my sand bed and i am worried bc before this happend i ordered some expensive acropora and idk if this will effect or kill them, they come in a week, here are my water parameters.
NITRATE 20ppm
PHOSPHATE 0.02
AMMONIA 0
Calcium 400
Alk 9.5
Mag 1280
Salinity 1.024
Temp 80

FILTRATION
. UV Sterilizer
. Algae turf scrubber on 24/7
. Gfo reactor filled with high capacity gfo
. Protein skimmer

LIGHTING
. T5s 6inches from water

I did make some changes in my tank that could of been a factor to this problem. I added 50 of clean dry rock to tank 2 months ago, added 9 new fish and I also re did my aquascape with all my live rock last week. So Idk if moving around the rocks/new fish could of caused this?
Will this out break be a problem for sps?
ANY ADVICE WOULD BE MUCH APPRECIATED

 

[EvanDeVita]

syphon it out, use a UV, and give a blackout. If you are worried about losing corals from the blackout, take out what you can. You should also bring a sample of the dinos to your LFS if they have a microscope and find out what kind of dinos you have.

 

[Gold3nboi]

Thank you for the info, sadly I do not have a lfs capable of doing that . And yes I will try siphoning more out it comes back fast tho. Will constant removal of cyano stuck to sand effect the tank?

 

[EvanDeVita]

Thank you for the info, sadly I do not have a lfs capable of doing that . And yes I will try siphoning more out it comes back fast tho. Will constant removal of cyano stuck to sand effect the tank?

Sipohning out the cyano shouldn't affect the tank. Siphoning Dino's, however, doesn't do much on its own.

 

[vetteguy53081]

That is a cyano. Vacuum up and reduce white light.
Also test and assure your phosphates and nitrates are not elevated which will promote this. Also add a pouch of Chemipure elite if Phos/nitrate is high to reduce it and keep it in check

 

[Gold3nboi]

Sipohning out the cyano shouldn't affect the tank. Siphoning Dino's, however, doesn't do much on its own.

Thank you and sorry I meant will it matter if I am siphoning sand with the cyano?

That is a cyano. Vacuum up and reduce white light.
Also test and assure your phosphates and nitrates are not elevated which will promote this. Also add a pouch of Chemipure elite if Phos/nitrate is high to reduce it and keep it in check

Thank you for your reply. And currently I have 4 bulb fixture, I can control turn if 2 at a time. Should I have just 2 on and 2 off. Current t5 bulbs are 2 Ati blue atinic, atinic, purple plus.